Plaster-board edge



July 1, 1930.. j TURNER 1,768,867

PLASTER BOARD EDGE Filed May 1'? 1926 INVENTOR J o/m I Turner ATTORNEYSPatented July 1, 1930 UNITED STATES PATENT OFFICE JOHN J'. TURNER, 0FWILLIAMSVILLE, N W YORK, ASSIGNOR TO NATIONAL GYPSUM COMPANY, OFBUFFALO, NEW YORK, A CORPORATION OF DELAWARE PLASTER-IBOARD EDGEApplication filed May 17,

This invention relates to plaster boards, and particularly to theconstruction of the edges of such boards. One of the principal featuresof this invention relates to the manner in which the edges of plasterboard liners cooperate with the adjacent plaster, one of thedistinguishing features of my invention being the provision of a linerhaving a beveled edge adhering to the plaster.

Those who have occasion to use or handle plaster boards faced on one orboth sides with a liner are familar with the difficulties commonlyencountered unless some effort is made to protect the edges of theproduct. If the plaster board is simply provided with liners whichterminate flush with the edges of the board, there is always a tendencyfor the edge of the liner to become loosened from the plaster and thereis a tendency for the plaster to crumble along the edges, where it isnot protected in any way. Various attempts have been made to overcomethese well-known difficulties, and the present invention may beconsidered as the result of such an attempt. Furthermore, this inventioncontemplates not only preventing the liner from being accidentallypulled away from the plaster along the edges of the plaster board, butit contemplates providing a plaster board having a certain amount ofplaster exposed along the edge. This is desirable in order that adjacentboards will have a plaster to plaster contact with each other, or sothat the cementing material used between adjacent boards can come indirect contact with the plaster.

In general, my invention contemplates the provision of plaster boardliners which may be of ordinary construction and may be of the usualmaterial, but with the added feature of having one or more beveled edgesadapted to come in contact with the plaster and adhere to the same. Ifthe plaster board liner is simply cut at right angles to thesurface ofthe liner, there is of course only a very small edge surface presentedto which the plaster may adhere. I have found that by forming a bevelededge on the liner, it is possible to increase this'area toa considerableextent, and thus increase the bond 1926. Serial No. 109,620.

between the plaster and the edge of the liner. It is desirable, althoughnot necessary, to make the improved product so that the sharp portion ofthe beveled edge of the liner will e exposed. Under certain conditionsthis avoids the formation of sharp projections on the bod of plasterwhich might easily break 0 and perhaps render the product unfit for use.

According to my invention, the liners with beveled edges can be appliedto the plaster board in such a manner that the liners terminate at theedges of the plaster board instead of extending around the corner ofeach edge so as to cover a portion of the edge. According to one of thepreferred embodiments of my invention, however, at least one of theliners is applied to the plaster board so that it covers a portion butnot all of one or more .edges of the plaster board. Such portions arereferably provided with beveled edges w ich adhere to the plasteradjacent thereto.

The various objects and advantages of my invention can be bestunderstood by considering the following detailed description, which isto be taken in conjunction with the accompanying drawings, in which Fig.1 is a perspective view of one embodiment of my invention; and

Fig. 2 is an enlarged section view of the product shown in Figure 1.

In the accompanying drawings I have illustrated a gypsum or plasterboard which is of ordinary construction except for the manner in whichthe ends of the board are formed. The gypsum or plaster board proper isshown at 3, liners 1 and 2 being applied tothe faces of the plasterboard. These liners can be made out of heavy paper, cardboard or anyother material commonly used for this purpose, and they can be appliedto the plaster surfaces in the usual manner.

Upon referrin to Figure 2, it will be noticed that the liner 1 isprovided with a beveled edge 4 located near one edge of the plasterboard 3. The liner 1 terminates at the margin of the plaster board; thatis, it does not extend around the corner of the edge so as to cover anyportion of the edge. The beveled surface is lar e in extent comparedwith what it woul be if the liner were simpl cut off at right angles toits surface, an accordingly there is a considerable area in actualcontact with the plaster. This serves to prevent accidental loosening ofthe edge of the liner from the plaster, and even thou h the sharp edgeof the beveled ortion 0% the liner is exposed, there is sufiicient bondbetween the remainder of the beveled portion and the plaster to preventthe liner from being accidentally pulled away from the plaster board.

It will be understood that when the liners are pressed in place on theplaster before the latter has hardened, the plaster is brought intointimate contact with the beveled edges of the liners, as shown at 4 inFigure 2.

Instead of having the liner terminate at the margin of the plasterboard, as shown at 4 in Figure 2, I may have the liner extend around soas to cover a portion of the edge of the plaster board. A liner 2 havingsuch an extended portion 6 is also shown in Figure 2. Portion 6 ispreferably, though not necessarily, integral with the body portionof theliner 2. The portion 6 may be and preferably is provided with a bevelededge 7 adhering to the adjacent plaster. This insures an excellent bondbetween the plaster and the edge of the up-turned portion 6 of the liner2.

The edge of the plaster board constructed as shown in Figure 2 is fullyprotected by the portion 6, which forms a protecting strip extendingalong the entire edge of the plaster board and across a portion of thisedge. The remaining portion of the plaster board edge is exposed so thatadjacent plaster boards will have a plaster to plaster contact, or sothat the plaster of one board can be effectively cemented to the plasterof the adjacent board.

My invention adequately meets the requirements of quantity production;the plaster board liners can be easily provided with beveled edges andthe edges can be easily bent so as-to form portions such as that shownat 6, which rotect the edges of the plaster board. T he edges of theboard are not only adequately protected, but the edges of the liners arealso fully protected because of the strong bond between these edges andthe plaster. Furthermore, my improved product has practically all theadvantages incident to having at least a certain amount of plasterexposed along the-edges of the board.

The stri of material 6, which extends along an e ge of the plaster boardand part way across this edge, is preferably, though not necessarily,integral with one of the liners, for example, the liner shown at 2 inFigure 2. Such a liner may form the exposed or front surface of theplaster board and the back surface can be covered with a liner such asthat shown at 1 in Figures 1 and 2. It is desirable to have the frontliner provided with a portion such as that shown at 6, which preventsthe plaster from being ex sed between adjacent laster boards. he linerfor the back of t e board may be of exactly the same form as the frontliner, or it may be of different form, as circumstances require.

It is to be understood that my invention is not confined to the singleembodiment herein illustrated and described, but includes suchmodifications thereof .as fall within the scope of the appended claims.

I claim:

1. The combination of a plaster board and at least one liner adhering tothe board, the said liner having a beveled edge in contact with theplaster and terminating at one corner of the edge of the board.

2. The combination of a plaster board, a liner adhering to one face sideof the board, the said liner having a beveled edge in contact with theplaster and terminating at the adjacent corner of the edge of the board,and a strip of material extending along this edge of the board andspaced apart from the beveled edge of said liner so as to cover only aportion of this edge of the board, thereby exposing a considerableportion of said edge, said strip being of uniform thickness with abeveled edge adhering to the plaster.

3. The combination of a plaster board, a liner adherin to one face ofthe board and having the e ge thereof terminating at the adjacent cornerof the margin of the board and a second liner adhering to the o positeface of the board, said second liner liaving a portion extendingapproximatel halfway across one edge of the plaster boar whereby aplaster to plaster contact may be established between said board and anadjacent board, the said ortion of said second liner having a beve ededge adhering to the plaster.

In testimony whereof I afiix my si nature.

JOHN J. TUR ER.

